An analyst gathers the following information (in € millions) about a company's land that is valued under the revaluation model:

Item	Value (€ millions)
Purchase cost	20
Carrying amount after first revaluation at 31 December Year 1	18
Carrying amount after second revaluation at 31 December Year 2	23

As a result of the second revaluation, the revaluation surplus increases (in € millions) by: